package com.jwkj.collector.modbus.util;

import java.util.Arrays;


public class ByteUtils {

    public static final int MIN_MID_VALUE = 1;

    public static final int MAX_MID_VALUE = 65535;

    //bytes 转二进制整数
    public static int bytes2Int(byte[] b, int start, int length) {
        int sum = 0;
        int end = start + length;
        for (int k = start; k < end; k++) {
            int n = ((int) b[k]) & 0xff;
            n <<= (--length) * 8;
            sum += n;
        }
        return sum;
    }

    //int按长度转byte
    public static byte[] int2Bytes(int value, int length) {
        byte[] b = new byte[length];
        for (int k = 0; k < length; k++) {
            b[length - k - 1] = (byte) ((value >> 8 * k) & 0xff);
        }
        return b;
    }

    //判断是否传了mid
    public static boolean isValidofMid(int mId) {
        if (mId < MIN_MID_VALUE || mId > MAX_MID_VALUE) {
            return false;
        }
        return true;
    }

    /***
     * byte转16进制字符串
     */
    public static String parseByte2HexStr(byte[] buf) {
        if (null == buf) {
            return null;
        }

        StringBuffer sb = new StringBuffer();
        for (int i = 0; i < buf.length; i++) {
            String hex = Integer.toHexString(buf[i] & 0xFF);
            if (hex.length() == 1) {
                hex = '0' + hex;
            }
            if (i != 0) {
                sb.append(" ");
            }
            sb.append(hex.toUpperCase());
        }
        return sb.toString();
    }

    /**
     * byte数组转字符串
     */
    public static String byte2String(byte[] buf, int start, int end) {
        byte[] datas = Arrays.copyOfRange(buf, start, end);
        String hexStr = parseByte2HexStr(datas);
        String value = hexString2String(hexStr);
        return value;
    }

    /**
     * Convert byte[] to hex
     * string.这里我们可以将byte转换成int，然后利用Integer.toHexString(int)来转换成16进制字符串。
     *
     * @param src byte[] data
     * @return hex string
     */
    public static String bytesToHexString(byte[] src) {
        StringBuilder stringBuilder = new StringBuilder("");
        if (src == null || src.length <= 0) {
            return null;
        }
        for (int i = 0; i < src.length; i++) {
            int v = src[i] & 0xFF;
            String hv = Integer.toHexString(v);
            if (hv.length() < 2) {
                stringBuilder.append(0);
            }
            if (i != 0) {
                stringBuilder.append(" ");
            }
            stringBuilder.append(hv);
        }
        return stringBuilder.toString().toUpperCase();
    }

    /**
     * Convert hex string to byte[]
     *
     * @param hexString the hex string
     * @return byte[]
     */
    public static byte[] hexStringToBytes(String hexString) {
        if (hexString == null || hexString.equals("")) {
            return null;
        }
        hexString = hexString.toUpperCase().replaceAll(" ", "");
        int length = hexString.length() / 2;
        char[] hexChars = hexString.toCharArray();
        byte[] d = new byte[length];
        for (int i = 0; i < length; i++) {
            int pos = i * 2;
            d[i] = (byte) (charToByte(hexChars[pos]) << 4 | charToByte(hexChars[pos + 1]));
        }
        return d;
    }

    /**
     * Convert char to byte
     *
     * @param c char
     * @return byte
     */
    private static byte charToByte(char c) {
        return (byte) "0123456789ABCDEF".indexOf(c);
    }

    /**
     * @Title:bytes2HexString
     * @Description:字节数组转16进制字符串
     * @param b 字节数组
     * @return 16进制字符串
     * @throws
     */
    public static String bytes2HexString(byte[] b) {
        StringBuffer result = new StringBuffer();
        String hex;
        for (int i = 0; i < b.length; i++) {
            hex = Integer.toHexString(b[i] & 0xFF);
            if (hex.length() == 1) {
                hex = '0' + hex;
            }
            if (i != 0) {
                result.append(" ");
            }
            result.append(hex.toUpperCase());
        }
        return result.toString();
    }

    /**
     * @Title:hexString2Bytes
     * @Description:16进制字符串转字节数组
     * @param src 16进制字符串
     * @return 字节数组
     * @throws
     */
    public static byte[] hexString2Bytes(String src) {
        src = src.replaceAll(" ", "");
        int l = src.length() / 2;
        byte[] ret = new byte[l];
        for (int i = 0; i < l; i++) {
            ret[i] = (byte) Integer.valueOf(src.substring(i * 2, i * 2 + 2), 16).byteValue();
        }
        return ret;
    }

    /**
     * @Title:string2HexString
     * @Description:字符串转16进制字符串
     * @param strPart 字符串
     * @return 16进制字符串
     * @throws
     */
    public static String string2HexString(String strPart) {
        StringBuffer hexString = new StringBuffer();
        for (int i = 0; i < strPart.length(); i++) {
            int ch = (int) strPart.charAt(i);
            String strHex = Integer.toHexString(ch);
            hexString.append(strHex);
        }
        return hexString.toString();
    }

    /**
     * @Title:hexString2String
     * @Description:16进制字符串转字符串
     * @param src 16进制字符串
     * @return 字节数组
     * @throws
     */
    public static String hexString2String(String src) {
        src = src.replaceAll(" ", "");
        String temp = "";
        for (int i = 0; i < src.length() / 2; i++) {
            temp = temp + (char) Integer.valueOf(src.substring(i * 2, i * 2 + 2), 16).byteValue();
        }
        return temp;
    }

    /**
     * 16进制字符串转int整整
     */
    public static int hexString2Int(String src) {
        return Integer.parseInt(src, 16);
    }
    /*
	 * public static byte[] string2Bytes(String src){ String hexString =
	 * string2HexString(src); byte[] bytes = hexString2Bytes(hexString); return
	 * bytes; }
	 */

    /**
     * String 转byte数组
     */
    public static byte[] string2Bytes(String src) {
        byte[] bytes = new byte[src.length()];
        for (int i = 0; i < src.length(); i++) {
            bytes[i] = (byte) src.charAt(i);
        }
        return bytes;
    }

    /**
     * @Title:char2Byte
     * @Description:字符转成字节数据char-->integer-->byte
     * @param src
     * @return
     * throws
     */
    public static Byte char2Byte(Character src) {
        return Integer.valueOf((int) src).byteValue();
    }

    /**
     * @Title:intToHexString
     * @Description:10进制数字转成16进制
     * @param a 转化数据
     * @param len 占用字节数
     * @return @throws
     */
    public static String intToHexString(int a, int len) {
        len <<= 1;
        String hexString = Integer.toHexString(a);
        int b = len - hexString.length();
        if (b > 0) {
            for (int i = 0; i < b; i++) {
                hexString = "0" + hexString;
            }
        }
        return hexString;
    }

//    public static void main(String args[]) {
//        System.out.println(hexString2String("3133383131313536373838"));
//    }
}
